Magazine feeding mechanism for an explosive charge operated setting tool

ABSTRACT

A magazine feeding mechanism for feeding a magazine in a setting tool which contacts and is moved by the reciprocation of the barrel which moves The magazine includes a plurality of cartridges which are moved successively into alignment with a cartridge chamber defined in a moving barrel of the setting tool. The mechanism comprises a feeding or indexing lever member which is pivoted by movement of the barrel to engage and index or move the magazine during each firing operation. The magazine feeding lever includes a first arm portion with a camming surface which contacts and is moved by the reciprocation of the barrel which moves in a driving direction after the explosion of each cartridge. The lever member also includes a second arm portion which engages in a side notch of a magazine band and moves the magazine band upwardly into a position at which the next cartridge is aligned with the barrel during the retreating movement of the barrel to its original position during coiling of the gun. A feature of the arrangement is that the lever is mounted so that it may be moved in three separate planes. A spring biases the lever in a direction which it is urged toward the side of the magazine to engage in a notch thereof and the pivotal mounting permits it to move laterally out of the notch during its downward movement backwardly and laterally to engage in the next lower notch for a subsequent upward indexing movement.

United States Patent [72] lnventor Helmut Oesterle Feldkirch-Noi'els, Austria 21 AppLNo. 806,207

[22] Filed Mar. 11,1969

[45] Patented Jan. 12, 1971 7 3 1 Assignee Hilti Aktiengesellschait Schaan, Liechtenstein [32] Priority Sept; 9, 1968 [3 3 Germany [54] MAGAZINE FEEDING MECHANISM FOR AN EXPLOSIVE CHARGE OPERATED SETTING TOOL 11 Claims, 4 Drawing Figs.

52 U.S.Cl

Primary Examiner-Granville Y. Custer, Jr. AztorneyMcGlew and Toren ABSTRACT: A magazine feeding mechanism for feeding a magazine in a setting tool or gun. The magazine includes a plurality of cartridges which are moved successively into alignment with a cartridge chamber defined in a moving barrel of the setting tool. The mechanism comprises a feeding or indexing lever member which is pivoted by movement of the barrel to engage and index or move the magazine during each firing operation. The magazine feeding lever includes a first arm portion with a camming surface which contacts and is moved by the reciprocation of the barrel which moves in a driving direction after the explosion of each cartridge. The lever member also includes a second arm portion which engages in a side notch of a magazine band and moves the 227/10, magazine band upwardly into a position at which the next car- 227/95 227/136 tridge is aligned with the barrel during the retreating move- [51] Int. Cl B25c 1/ l4 mem f the bane] to its original position during coiling f the [50] Field of Search 227/8, 9, gun A f t f the arrangement is that the lever is mounted 11,95 136 so that it may be moved in three separateplanes. A spring 56 R f biases the lever in a direction which it is urged toward the side 1 e erences of the magazine to engage in a notch thereof and the pivotal UNITED STATES PATENTS mounting permits it to move laterally out of the notch during 329,366 10/ l 885 Crisp 227/136 its downward movement backwardly and laterally to engage in 1,024,889 4/ 1912 Greenfield 227/95 the next lower notch for a subsequent upward indexing move- 3,363,817 l/l968 Brack 227/9 ment.

1'' 3 2 4 I .9 Fl 79 $4 7 5a 8b l \\l r I j 1 I 1 E PATENTFH JAN 1 2 1971 SHEET a []F 3 m at Irvin/rag 4 17b (Mm 5 MAGAZINE FEEDING MECHANISM FOR AN EXPLOSIVE CHARGE OPERATED SETTING TOOL SUMMARY OF THE INVENTION This invention relates in general to the construction of the operating mechanism for an explosive charge operated device, and in particular, to a new and useful magazine feeding mechanism for a setting tool of a type' which is adapted to drive an anchoring element into a hard receiving material.

The present invention is an improvement over the prior art, particularly in respect to an arrangement for feeding a band magazine containing a plurality of cartridges which are held in separate projections of the band an which are fed at right angles to the movement of the barrel def ning a cartridge chamber. The mechanism is used principally for'a setting tool or a tool which is adapted to drive a small size anchoring element such as a nail, bolt and the like into a hard receiving material for example, concrete or steel. In tools of this type it is important that the automatic magazine transport operate free of any malfunction since the safety of thetool depends to a large extent on the safe introduction of the cartridge into the cartridge chamber. The invention provides a tool having a safe and reliable feed of a cartridge magazine containing a plurality of cartridges so that each cartridge in succession is successive Iy aligned with the barrel of the device for successive firings of the tool.

In accordance with the invention there is provided a magazine feeding mechanism which includes a double armed lever which is pivotally mounted about a pin carried on the side of the tool at a location directlybclow a barrel which is slidable in thehousing of the tool. The tool is mounted about a pin for universal movement inthree' separate planes and thus may swing backwardly and; forwardly and upwardly and downwardly. The magazine'is movable through a passageway defined at right angles to the movement of the barrel and which extends through the handle of-the tool. The magazine is inserted from the bottom of the handleand when it is in a posi- -tion at which the uppermost cartridge is aligned with the bar- .rel cartridge chamber 'itis held against downward release by a spring locking member. The cartridge magazine is formed as a band having notches along at least one side edge but preferably along two side edges so that the cartridge band may be inserted from either end. The lever mechanism has one arm portion which is biased in a direction to cause it to move along the side edge of the magazine bandand' engage in a notch thereof. During the retreating movement of 'the barrel after a previously fired shot the lever is-pulleddownwardly by the force of the spring and also pulled in toward the associated notches in the side of the band to engage in the next lower notch. When the barrel again returns toward a cocked position it rocks the lever by contacting a cam surface thereof which is disposed in a path of the movement of the barrel. The lever moves the opposite end upwardly to index the magazine band to a position at which the next cartridge in a row is aligned with the cartridge chamber of the barrel. In the cocked position the barrel engages around conical projections of the cartridge magazine band and surrounds the cartridge outer tip. When the cartridge is then fired by pulling the trigger of the device the movement of the barrel and the associated drive piston therein will effect the driving in of the anchoring device and will also move the lever member to shift the second arm portion downwardly along the side of the magazine to the next notch therebeneath. The biasing spring engaging this second arm portion of the lever permits the outward lateral movement of the lever during this movement.

Accordingly, it is an object of the invention to provide a safe and reliable magazine feeding mechanism for use with an explosive charge operated device.

A further object of the invention is to provide a setting tool for driving anchoring elements into a hard receiving material which includes a sliding barrel member therein defining a cartridge chamber the housing defining a passageway for the feeding of a magazine at right angles to the barrel movement. the magazine having a plurality of spaced cartridges therealong being movable to successively align each cartridge with the cartridge chamber of the barrel for effecting a plurality of firings of the devicei the magazine being indexed during each tiring operation by a pivotal lever member which is pivoted for movement in three separate planes and which includes an arm portion which is biased downwardly and laterally by a spring member to engage in a notch of a magazine and move it upwardly during each firing cycle.

A further object of the invention is to provide a magazine feeding mechanism which is simple in design. rugged in construction, and economical to manufacture.

The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated and described a preferred embodiment of i the invention.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is a longitudinal sectional view of a setting tool or gun constructed in accordance with the invention;

FIG. 2 is a partial longitudinal sectional view and partial elevational view of a gun indicated in FIG. I, but with the barrel shown in an extended position after firing;

FIG. 3 is a partial elevational and partial longitudinal sectional view of the gun indicated in FIG. 1 but with the magazine being advanced by one position after the firing of one cartridge; and

FIG. 4 is a section taken on lines lV-IV of FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT i Referring to the drawings in particular. the invention embodied therein comprises a setting tool or gun generally designated 1 for use in driving anchoring element's such as nails, bolts, and similar articles into a hard receiving material. The tool 1 includes an outer casing or housing 50 having a front section in which a barrel member or barrel 2 carries a stand plate 3 which may be positioned to abut against the receiving material when the device is to be operated. A driving piston 4 is slidable outwardly within the barrel 2 upon the explosion of an explosive charge cartridge 5 in a cartridge chamber 6 defined at the end of the barrel. The cartridge 5 is tired by an ignition pin 7 which is prestressed upon the pressing of the stand pipe 2 against the material into which the anchoring element is to be fired. The anchoring element is positioned within the stand plate 3 and abuts against the end of the drive piston 4 in the firing position.

The ignition pin 7 is prestressed by the force of springs and 8b as shown in FIG. I, and this prestressing is accom plished by a rod member 9 which is provided at the rear end 20 of the barrel 2. The rod member 9 acts on a sleeve I0 which surrounds the pressure springs 80 and 8b. The prestressed igni tion pin is locked by a locking bolt 12 in the prestress state. The locking bolt 12 is mounted for vertical movement in respect to the axis of the ignition pin 7 in the sleeve 10. The locking bolt 12 is released when the nose 12a thereof is above the free end 13a of an angle lever 13 which is mounted for pivotal movement on a case pin 14. A second end 13b of the angle lever 13 is actuated by a trigger 15, which causes the end to push upwardly on the locking bolt 12 to release the stressed ignition pin which in the cocked firing position will be located thereabove.

In accordance with the feature of the invention a channel I6 extends substantially vertically at'a right angle to the axis of the barrel 2. A bandlike cartridge magazine 17 which holds a plurality of cartridges at fixed spaced relationship along the BEST AVAILABLE COPY length thereof is engaged in the receiving channel 16 up to a position at which the uppermost cartridge 5 held thereby is aligned with the cartridge chamber 6 of the barrel 2. As best seen in FIG. 4, the cartridge magazine band 17 is provided with a plurality of equally spaced notches 17b which are preferably arranged on both sides thereof in order to facilitate insertion of the band from either end. The adjacent notches 17b are separated by projections 17a behind which the feeding mechanism is engaged to advance the cartridge during each firing cycle. The magazine 17 is inserted until the lowermost ends of the band is located within the channel 16 which extends downwardly through the trigger handle la, and at this position, an elastic stop in a form of a leaf spring 21 will engage into a notch 17b on one side of the band and hold the band against retraction back downwardly through the bottom of the handle. Indexing movement of the band is in the direction of the arrow-X indicated in HO. 1. During the upward movement of the magazine the stop 21 will be defle'cted outwardly. The notches 17b are spaced apart by an amount equivalent to spacing of the cartridges 5 in the magazine band 17.

In accordance with a feature of the invention the indexing mechanism for advancing or transporting the magazine after each shot has been fired comprises a transport lever generally designated 18 which is arranged substantially parallel to the longitudinal axis of the gun and is mounted on a pivot pin 19 in a manner such that it will have substantially universal movement. For this purpose, the mounting opening 18c is made slightly larger than the diameter of the pivot pin 19. The transport lever includes a second arm portion 18a which extends rearwardly and terminates in a widened flange which is' adapted to engage in the notches 17b behind the projection 17a of the magazine band. The forward end or first arm portion 18b is provided with a surface or bulging surface which remains in engagement with the barrel 2. A spring 20 which as best seen in FIG. 4 is anchored at one end at a location below the lever and to one side of the magazine band and extends at its opposite upper end across the band to engage the lever arm portion 18a in a manner such that it is urged downwardly and inwardly against the side of the magazine band 17. Thus as seen in FIG. 4, the direction in which the spring acts is not exactly vertical but obliquely. The spring 20 permits the lever arm 18a to move outwardly during its downward movement but returns it into the notch 17b for engagement behind the projection 17a for a subsequent further upward indexing movement. A channel 16 defined on one side of the housing 50 within the handle portion 1a accommodates the lever during its downward movement at which his deflected outwardly beyond the projections 17a of the magazine band 17. A lower end 160 of the notch portion forms a lower stop for the movement ofthe lever 15.

The operation of the tool is as follows:

The cartridge magazine 17 is loaded into the channel 16 up to the position indicated in FlG. l. in this position the stop 21 prevents its withdrawal oownwardiy. The transporting lever 13 is oriented as indicated with the arm portion 18a in the uppermost position engaged in a notch l7!) of the magazine band 17. The first cartridge at the top of the magazine band is in a position to be inserted into the barrel cartridge chamber 6 when the barrel moves backwardly further from the position indicated in FIG. 1 (position not shown). The weapon is cocked by placing an anchoring element within the stand pipe 3 and by pressing the housing 50 by engagement of the handle inwardly against the receiving material to cause backward movement of the barrel 2 engagement of the anchoring element against the drive piston 4 and prestressing of the firing pin 7. In this position the trigger is pulled and the cartridge is fired. After releasing a shot and lifting the tool from the receiving material the spring 80 relaxes with the movement of the barrel 2 and subsequently the barrel 2 with the cartridge housing 6 returns to position indicated in F IG. 1.

To again load the device is necessary to index the magazine rrrr. 1 T-s:c ie aq-nr-y rl man the barrel returns from the extended position thereof indicated in FIG. 2 to the position indicated in FIG. 1. which produces an upwardly swinging movement of the arm portion 180 of the transport lever 18. During this upward movement the lever arm 18a first engages into the notch 17!) located below the next cartridge to be fired and then moves the magazine with the cartridge upwardly to a position at which the next adjacent cartridge aligns with the magazine chamber 6. During this time the spring 20 holds the transport lever arm 18a in engagement within the notch 17b; When the barrel 2 is again returned to the position of the start of the operation as shown in FIG 3 the curved surface of the lever arm 18b will engage at its highest point against the barrel 2. When the device is again pressed against the receiving material the cartridge which is next in line will move into the cartridge chamber 6 and the process may be repeated.

ln some instances the tool of this nature is designed without a hammer head iron. in such an event the' barrel 2 and the stand plate -3 are formed as a part which has a bore of uniform diameter. 1

lclaim:

1. An explosive charge operated device such as an anchoring element setting tool or gun for use with a magazine band having a plurality of cartridges arranged in spaced relation therealong, comprising a housing, a barrel, movable in said housing in a forward advancing direction during firing and in a rearward return direction, means defining-a cartridge receiving member in said housing, a magazine chamber defined in said housing extending transversely to said barrel and a .cartridge indexing lever movably mounted in said housing adjacent said barrel and having a cam surfaceengageable with said barrel and being movable upon each movement of said barrel in an advancing directionand-a subsequent return direction to index said magazine to successively align each cartridge with. the; cartridge receiving chamber and to thereafter move cartridge out of "alignment' with said cartridge receiving chamber. 4 l i 5 2. An explosive charge operateddevice,'according to claim 1, wherein said indexing lever is pivotally mounted in said housing and arranged so that its longitudinal axis extends sub stantially parallel to theaxis of said barrehsaid indexing lever having a first arm portion with said cam surface'extnding into engagement with said barreL'said lever having a second arm portion engageable with said magazineand being movable upwardly upon downward rocking movement of said first arm portion of said lever to move the magazine band upwardly to position the next cartridge in alignment with the cartridge receiving chamber and to move the previously aligned cartridge upwardly beyond the cartridge receiving chamber.

3. An explosive charge operated device, accordingto claim 3, wherein said pivotal mounting for said indexing lever includes a pivotal axle defined on said housing and extending in a substantially horizontal plane, said lever member having a bearing opening of a size larger than said pivotal axle, spring means biasing said first lever arm portion upwardly into en gagement with said barrel, said spring means also acting to urge said second arm portion transversely into engagement with said magazine.

4. An explosive charge operated device, according to claim 1, including a magazine band located within said magazine chamber said magazine band having a plurality of tubular projections adapted to the lower surrounding portion of each cartridge which projects from one side thereof, said magazine band being opened on the opposite side to receive the cartridge, said band having a plurality of notches defined in a side thereof extending along the length thereof at equally spaced locations, said lever member being mounted to permit its upward and downward movement and lateral shifting movement to engage in the notches of said magazine during each cycle of operation.

5. An explosive charge operated device, according to claim 4, including a pivot bearing pin defined in said housing below cairl barrel. said lever member having a pivot bearing opening larger than said pivot pin and being pivotal on said pin for movement in three separate planes, said lever member including a first arm portion with said cam surface thereon engageabit: with said barrel and a second arm portion engageable in a notch of said magazine, said lever member being rocked by movement of said barrel to provide an upward and downward movement of said second arm portion during each cycle of operation in order to index said magazine upwardly to successively present a cartridge into alignment with said cartridge receiving chamber, said spring means urging said second arm portion of said lever member in a direction to engage against theside of said cartridge chamber and to urge said second lever arm portion into a notch during upward indexing movement and to permit outward movement of said lever arm member along the side of said cartridge band during downward indexing movement of said lever arm member.

6. An explosive charge operated device, according to claim 5, including an elastic stop carried on said housing and en gageable with said magazine and preventing downward withdrawal of said magazine after .it is inserted beyond said stop.

7. An explosive charge operated device such as an anchoring element setting tool, comprising a housing having a hollow forward portion, a rear portion carrying a firing pin mechanism, and a hand portion carrying a pistol operating mechanism, a barrel slidable in the forward portion of said housing and having a bore terminating at its inner end in a car tridge receiving chamber, a drive piston slidable in the bore of said barrel for driving an anchoring element into a receiving material, a cartridge chamber defined through said handle and through the upper portion of said housing in a location at substantially right angles to the movement of said barrel, a cartridge magazine band having a plurality of tubular cartridge receiving recesses therethrough at equally spaced locations along the length thereof, said magazine band having a plurality of notches on a side thereof defined at equally spaced locations along the length thereof, a cartridge indexing lever pivotally mounted in said housing directly adjacent said barrel, said pivotal mounting being such that the indexing lever will move in three pianes, said indexing lever having a first arm with a control cam surface located to contact said barrel member and to be moved by said barrel member during the movement of said barrel member in said housing, said indexing lever having a second arm portion adapted to engage in associated notches of said magazine and to move the magazine upwardly during such engagement, said second arm portion being movable downwardly out of the notches to a next lower notch during each successive firing operation, and spring means biasing said second arm portion in a direction to engage against the side of the magazine and into the notch thereof but permitting outward movement out of the notch during second arm portion.

8. An explosive charge operated device, according to claim 7, including an elastic spring member mounted on said housing and extending into said magazine chamber and being deflectible by upward movement of said magazine into said chamber but preventing downwardly withdrawal of said magazine by engagement in a notch of said magazine.

9. An explosive charge operated device such as an anchoring element setting tool or gun having a magazine band with a plurality of cartridges arranged in spaced relation thercalong, comprising a housing, a barrel, movable in said housing in a forward advancing direction during firing and in a rearward return direction, said barrel having an inner end face with a cartridge receiving chamber defined therein, a magazine chamber defined in said housing extending transversely to said barrel and adapted to receive the magazine band with the cartridges oriented with their tips facing in the direction'of the cartridge receiving chamber of said barrel, and a cartridge indexing lever movably mounted in said housing adjacent said barrel and having a cam surface engageable with said barrel and being movable upon each movement of said barrel in an advancin direction and a subsequent return direction to index sai magazine to successively align each cartridge wrth the cartridge receiving chamber and to thereafter move the cartridge out of alignment with said cartridge receiving chamber.

10. An explosive charge operated device, according to claim 9, including a magazine band located within said magazine chamber, said magazine band having a plurality of notches defined in a side thereof extending along the length thereof at equally spaced locations, said lever member being mounted to permit its upward and downward movement and lateral shifting movement to engage in the notches of said magazine during each cycle of operation.

11. An explosive charge operated device, according to claim 10, wherein said indexing lever includes a first arm portion with said cam surface extending into engagement with said barrel and a second arm portion engageable with said magazine, said second arm portion including an end face which is greater in extent than the length of the recesses between said notches, and spring means biasing said second lever arm portion transversely into engagement with said 

1. An explosive charge operated device such as an anchoring element setting tool or gun for use with a magazine band having a plurality of cartridges arranged in spaced relation therealong, comprising a housing, a barrel, movable in said housing in a forward advancing direction during firing and in a rearward return direction, means defining a cartridge receiving member in said housing, a magazine chamber defined in said housing extending transversely to said barrel and a cartridge indexing lever movably mounted in said housing adjacent said barrel and having a cam surface engageable with said barrel and being movable upon each movement of said barrel in an advancing direction and a subsequent return direction to index said magazine to successively align each cartridge with the cartridge receiving chamber and to thereafter move the cartridge out of alignment with said cartridge receiving chamber.
 2. An explosive charge operated device, according to claim 1, wherein said indexing lever is pivotally mounted in said housing and arranged so that its longitudinal axis extends substantially parallel to the axis of said barrel, said indexing lever having a first arm portion with said cam surface extending into engagement with said barrel, said lever having a second arm portion engageable with said magazine and being movable upwardly upon downward rocking movement of said first arm portion of said lever to move the magazine band upwardly to position the next cartridge in alignment with the cartridge receiving chamber and to move the previously aligned cartridge upwardly beyond the cartridge receiving chamber.
 3. An explosive charge operated device, according to claim 3, wherein said pivotal mounting for said indexing lever includes a pivotal axle defined on said housing and extending in a substantially horizontal plane, said lever member having a bearing opening of a size larger than said pivotal axle, spring means biasing said first lever arm portion upwardly into engagement with said barrel, said spring means also acting to urge said second arm portion transversely into engagement with said magazine.
 4. An explosive charge operated device, according to claim 1, including a magazine band located within said magazine chamber said magazine band having a plurality of tubular projections adapted to the lower surrounding portion of each cartridge which projects from one side thereof, said magazine band being opened on the opposite side to receive the cartridge, said band having a plurality of notches defined in a side thereof extending along the length thereof at equally spaced locations, said lever member being mounted to permit its upward and downward movement and lateral shifting movement to engage in the notches of said magazine during each cycle of operation.
 5. An explosive charge operated device, according to claim 4, including a pivot bearing pin defined in said housing below said barrel, said lever member having a pivot bearing opening larger than said pivot pin and being pivotal on said pin for movement in three separate planes, said lever member including a first arm portion with said cam surface thereon engageable with said barrel and a second arm portion engageable in a notch of said magazine, said lever member being rocked by movement of said barrel to provide an upward and downward movement of said second arm portion during each cycle of operation in order to index said magazine upwardly to successively present a cartridge into alignment with said cartridge receiving chamber, said spring means urging said second arm portion of said lever member in a direction to engage against the side of said cartridge chamber and to urge said second lever arm portion into a notch during upward indexing movement and to permit outward movement of said lever arm member along the side of said cartridge band during downward indexing movement of said lever arm member.
 6. An explosive charge operated device, according to claim 5, including an elastic stop carried on said housing and engageable with said magazine and preventing downward withdrawal of said magazine after it is inserted beyond said stop.
 7. An explosive charge operated device such as an anchoring element setting tool, comprising a housing having a hollow forward portion, a rear portion carrying a firing pIn mechanism, and a hand portion carrying a pistol operating mechanism, a barrel slidable in the forward portion of said housing and having a bore terminating at its inner end in a cartridge receiving chamber, a drive piston slidable in the bore of said barrel for driving an anchoring element into a receiving material, a cartridge chamber defined through said handle and through the upper portion of said housing in a location at substantially right angles to the movement of said barrel, a cartridge magazine band having a plurality of tubular cartridge receiving recesses therethrough at equally spaced locations along the length thereof, said magazine band having a plurality of notches on a side thereof defined at equally spaced locations along the length thereof, a cartridge indexing lever pivotally mounted in said housing directly adjacent said barrel, said pivotal mounting being such that the indexing lever will move in three planes, said indexing lever having a first arm with a control cam surface located to contact said barrel member and to be moved by said barrel member during the movement of said barrel member in said housing, said indexing lever having a second arm portion adapted to engage in associated notches of said magazine and to move the magazine upwardly during such engagement, said second arm portion being movable downwardly out of the notches to a next lower notch during each successive firing operation, and spring means biasing said second arm portion in a direction to engage against the side of the magazine and into the notch thereof but permitting outward movement out of the notch during second arm portion.
 8. An explosive charge operated device, according to claim 7, including an elastic spring member mounted on said housing and extending into said magazine chamber and being deflectible by upward movement of said magazine into said chamber but preventing downwardly withdrawal of said magazine by engagement in a notch of said magazine.
 9. An explosive charge operated device such as an anchoring element setting tool or gun having a magazine band with a plurality of cartridges arranged in spaced relation therealong, comprising a housing, a barrel, movable in said housing in a forward advancing direction during firing and in a rearward return direction, said barrel having an inner end face with a cartridge receiving chamber defined therein, a magazine chamber defined in said housing extending transversely to said barrel and adapted to receive the magazine band with the cartridges oriented with their tips facing in the direction of the cartridge receiving chamber of said barrel, and a cartridge indexing lever movably mounted in said housing adjacent said barrel and having a cam surface engageable with said barrel and being movable upon each movement of said barrel in an advancing direction and a subsequent return direction to index said magazine to successively align each cartridge with the cartridge receiving chamber and to thereafter move the cartridge out of alignment with said cartridge receiving chamber.
 10. An explosive charge operated device, according to claim 9, including a magazine band located within said magazine chamber, said magazine band having a plurality of notches defined in a side thereof extending along the length thereof at equally spaced locations, said lever member being mounted to permit its upward and downward movement and lateral shifting movement to engage in the notches of said magazine during each cycle of operation.
 11. An explosive charge operated device, according to claim 10, wherein said indexing lever includes a first arm portion with said cam surface extending into engagement with said barrel and a second arm portion engageable with said magazine, said second arm portion including an end face which is greater in extent than the length of the recesses between said notches, and spring means biasing said second lever arm portion transversely into engagement with said magazine, only a portion of the end of said seconD lever arm portion fitting into the recess between said notches and being easily removable from said notches during a subsequent movement thereof. 